1770221730 has 128 divisors (see below), whose sum is σ = 4646937600. Its totient is φ = 429871104.

The previous prime is 1770221729. The next prime is 1770221731. The reversal of 1770221730 is 371220771.

It is an interprime number because it is at equal distance from previous prime (1770221729) and next prime (1770221731).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1770221731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2134956 + ... + 2135784.

It is an arithmetic number, because the mean of its divisors is an integer number (36304200).

Almost surely, 2^1770221730 is an apocalyptic number.

1770221730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1770221730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2323468800).

1770221730 is an abundant number, since it is smaller than the sum of its proper divisors (2876715870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1770221730 is a wasteful number, since it uses less digits than its factorization.

1770221730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 1770221730 is about 42074.0030184911. The cubic root of 1770221730 is about 1209.6950099879.

The spelling of 1770221730 in words is "one billion, seven hundred seventy million, two hundred twenty-one thousand, seven hundred thirty".